Blade pitch

About: Blade pitch is a research topic. Over the lifetime, 5321 publications have been published within this topic receiving 63134 citations.

Rotor system for winged aircraft

Abstract: A rotor system for a rotor convertible fixed winged aircraft comprising a rotatable rotor shaft mounted on one of the wings of the aircraft, the shaft tiltable between a substantially vertical position and a substantially horizontal position, a rotor mounted to the shaft and including at least one blade, the blade having an adjustable blade angle relative to the shaft, apparatus for tilting the shaft between the vertical and horizontal positions, controls responsive to the tilting of the shaft for automatically adjusting the blade angle of a blade to an autogyro blade angle when the shaft is in the vertical position and to a substantially feathered blade angle when the shaft is in the horizontal position.

Rotary-wing drone with gearless-drive and fast-mounting propellers

Abstract: Each propulsion unit of the drone comprises a propeller ( 20 ) and a rotary-cage synchronous electric motor whose stator is connected to the drone body. The propulsion unit in of the gearless type, the rotor of the motor being rotationally integral with the propeller hub ( 24 ). The rotor is integral with an upper flange ( 56 ) extending in a radial plane with respect to the axis of rotation. Reversible means are provided for the fast coupling of the propeller to the rotor, implementing studs ( 62 ) with an enlarged head ( 66 ) formed on the flange, which cooperate with homologous curvilinear buttonholes ( 32 ) formed on the hub. The switching from the decoupled position to the locked position is operated by relative rotation of the propeller hub with respect to the flange by a fraction of a turn, in an opposite direction with respect to the direction of rotation of the motor.

Propeller arrangement, in particular for ship propulsion plants

Abstract: Conventional propellers are borne on a hub bearing in their centre. The axial forces acting on the blade tips (3) in particular subject the blades (7) to a large bending moment. Therefore, the blades have to be of very massive construction, which however increases the stresses on the propeller due to centrifugal forces. So the size of such propellers is limited. Furthermore, the cost of the materials for manufacturing conventional propellers is comparatively high. In order to overcome these disadvantages, it is proposed that a propeller (2) equipped with an outer ring (4) be mounted, together with this outer ring (4), in a housing (5), so that a hub bearing can be dispensed with. The axial bending moments acting on the blades (7) of the propeller (2) are reduced, so the blades (7) can be made lighter. The centrifugal forces thus reduced also make larger propeller diameters possible than in the current state of the art. The propeller arrangement (1) can be utilised for ship propulsion and wind generators.

Wind Turbines and Other Rotating Structures with Instrumented Load-Sensor Bolts or Instrumented Load-Sensor Blades

Abstract: A turbine includes a turbine blade, a plurality of sensors, a wireless sensor module, a data aggregator, and a blade pitch control unit The plurality of sensors are distributed in a plurality of locations on the turbine blade suitable for determining a moment of the turbine blade The sensor module is configured to transmit data to the data aggregator to determine the moment The data aggregator is configured to provide an output to the blade pitch control unit The blade pitch control unit is configured to adjust pitch of the turbine blade based on the moment